Android: get result from callback (networking KOUSH ION)

Question

For my app I need to contact our API from our server which returns some JSON.

While downloading the JSON, it should display a progressbar.

I figured I should

Answer 1

In my opinion the cleanest solution is to create a service that handles the dirty download logic and returns a future of your custom response class, that contains the success info and the json object.

// in e.g JsonResponse.java
public class JsonResponse() {
    public boolean ok;
    public JsonObject json;
}

// in Service.java
public Future getId(final String id) {
    final SimpleFuture jsonFuture = new SimpleFuture<>();

    String url = IPAddress.PRODUCTION + Variables.get_id + id;
    Ion.with(context)
    .load("GET", url)
    .asJsonObject()
    .withResponse()
    .setCallback(new FutureCallback>() {
        @Override
        public void onCompleted(Exception e, Response response) {
            JsonResponse jsonResponse = new JsonResponse();
            if (response != null) {
                if (response.getHeaders().code() != 200) {
                    jsonResponse.ok = false;
                } else {
                    jsonResponse.ok = true;
                    jsonResponse.json = response.getResult();   
                }
            }
            jsonFuture.setComplete(jsonResponse);
        }
    });

    return jsonFuture;
}


// in Activity.java
private void loadUser(String userId) {    
    mLoadingSpinner.setVisibility(View.VISIBLE);

    service.getId(userId)
    .setCallback(new FutureCallback() {

        // onCompleted is executed on ui thread
        @Override
        public void onCompleted(Exception e, JsonResponse jsonResponse) {
            mLoadingSpinner.setVisibility(View.GONE);
            if (jsonResponse.ok) {
                // Show intent using info from jsonResponse.json
            } else {
                // Show error toast
            }
        }
    });
}